Title: [ARC] ETH Interest Rate Curve Update
Author: @Llamaxyz @MatthewGraham @Dydymoon
@Llamaxyz presents a proposal to amend ETH interest rate parameters on the Aave Ethereum v2 and Ethereum v3 (when deployed) Liquidity Pools.
With Aave v3 about to be deployed on Ethereum and a wstETH and ETH eMode likely, the ETH Interest Rate should be adjusted such that the looped recursive strategy breaks even within Slope 1 where the Interest Rate changes are less volatile.
The new interest rate curve has an Interest Rate of 5.75% at the Uoptimal point, which is 25 bps more than stETH yield at the time of writing. This proposal will lead to improved capital efficiency of the ETH Reserve and generate more revenue for the DAO when compared to just replicating the v2 Interest Rate curve on v3 with the introduction of an ETH eMode Category.
For the existing v2 market, @llamaxyz suggests adopting the same Interest Rate parameters as being proposed on v3. This will enable the ETH yields across the markets to somewhat equalize leading to higher utilization of the ETH Reserve and more revenue for the DAO.
By changing the Interest Rate at the Uopotimal point from 3% to 5.75%, when an eMode for ETH and wstETH is created on Aave v3 the recursive strategy will break even prior to reaching the Uoptimal utilization within the Reserve. This is a desirable feature as the volatility of the Interest Rate on Slope 1 is less than Slope 2. By setting the Slope 1 parameter at 5.75%, 25 bps greater than the current annual wstETH yield, utilization in the Reserve is not expected to reach the Uoptimal level for any prolonged period of time. By reducing the Slope 2 parameter, from 100 to 80, the gradient of the second part of the yield curve increases due to an increase in Uoptimal from 70% to 80%. This is subtle and can be seen in the chart below. The Base Rate for the existing Interest Rate and proposed Interest Rate is unchanged at 0%.
With the new Interest Rate curve recommended for the v3 deployment, it is reasonable to expect the yield across the v2 and v3 deployment to be arbitraged. If the yield on the v3 deployment converges to the wstETH rate, then this will shift the v2 Reserve utilization beyond the Uoptimal level set at 3%. Because of this, it is recommended to also change the v2 Interest Rate to match the v3 deployment Interest Rate. This way both v2 and v3 Reserves will experience utilization along the Slope 1 portion of the Interest Rate curve whilst also benefiting from improved capital efficiency.
The graphic below shows the changes in the interest rate.
This proposal increases the Reserve Factor from 10% to 15%, directing 15% of the interest paid to Aave DAO. When combined with the Interest Rate changes, the v2 deployment will generate an estimated $13.1k per day, up from around $5.5k per day. Prior to this proposal, due the implementation of AIP-68, the Aave DAO is earning less revenue from the ETH Reserve post merge despite utilization within the Reserve increasing significantly over that time, .
The below table shows the current and proposed changes to the ETH Reserve on Ethereum v2 and Ethereum v3 when deployed.
|Parameter||Current (%)||Proposed (%)|
 Aave - Open Source Liquidity Protocol
 Optimize rate curve for ETH & improve revenue generation
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